1 /*-
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 * Keith Bostic. All rights reserved.
6 *
7 * See the LICENSE file for redistribution information.
8 */
9
10 #include "config.h"
11
12 #include <sys/types.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15
16 #include <bitstring.h>
17 #include <limits.h>
18 #include <stdio.h>
19
20 #include "../common/common.h"
21
22 /*
23 * ex_equal -- :address =
24 *
25 * PUBLIC: int ex_equal(SCR *, EXCMD *);
26 */
27 int
ex_equal(SCR * sp,EXCMD * cmdp)28 ex_equal(SCR *sp, EXCMD *cmdp)
29 {
30 recno_t lno;
31
32 NEEDFILE(sp, cmdp);
33
34 /*
35 * Print out the line number matching the specified address,
36 * or the number of the last line in the file if no address
37 * specified.
38 *
39 * !!!
40 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
41 * empty file displayed 1. Until somebody complains loudly,
42 * we're going to do it right. The tables in excmd.c permit
43 * lno to get away with any address from 0 to the end of the
44 * file, which, in an empty file, is 0.
45 */
46 if (F_ISSET(cmdp, E_ADDR_DEF)) {
47 if (db_last(sp, &lno))
48 return (1);
49 } else
50 lno = cmdp->addr1.lno;
51
52 (void)ex_printf(sp, "%ld\n", lno);
53 return (0);
54 }
55